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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28be3c9133e48706cf7353063a0273779f1398ac2d1295ff35155c11dcc9818' 
  AND token = 'A1hyw5GGDsNIK8GSkxSg1YCJW7I+urA8Iqm8DCgix54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}